Sheathing for boiler-tubes.



N0. 784,094. PATENTED MAR. 7, 1905. J. D. ALEXANDER.

SHEATHING FOR BOILER TUBES.

APPLIUATIOH FILED JAN. 3, 1905.

2 SHEETS-SHEET 1.

H z l i z If! M 1| Ml WI"? EEEEE: m %Lz0% No. 784,054. PATENTED MAR. 7, 1905.

' J. D. ALEXANDER.

SHBATHING FOR BOILER TUBES.

APPLICATION FILED JAN. 3, 1905.

2 SHEETS-SHEET 2.

STATES Patented March '7, 1905.

PATENT OFFICE. I

JOHN D. ALEXANDER, OF TROY, NEW YORK, ASSIGNOR "O FRANKLIN BOILER WORKS, OF GREEN ISLAND, NEW YORK, A CORPORATION OF NEW? YORK.

SHIEATHING FOW BOILER-TUBES.

SPECIFICATION forming part of Letters Patent No. 784,09&, dated March '7, 1905.

Application filed January 3, 1905. Serial No- 239,343-

To all whom it may concern;

Be it known that I, JOHN D. ALEXANDER, a citizen of the United States, residing at Troy, county of Rensselaer, and State of New York, have invented certain new and useful Improvements in Sheathing for Boiler-'Ilubes, of which the following is a specification.

Theinvention relates to such improvements; and it consists of the novel construction and combination of parts hereinafterdescribed and Subsequently claimed.

Reference may be had to the accompanying drawings and the reference characters marked thereon, which form a part of this specification.

Similar characters refer to similar parts in the several figures.

Figure 1 of the drawings is a top plan view of three boiler-tubes provided with my improved sheathing. Fig, 2 is a cross-section of the same, taken on the broken line 2 2 in Fig. 1. Fig. 8 is a side view of a boiler-tube with the sheathing applied thereto. Fig. 4: is a view in isometric-al perspective of one of the keys detached. Fig. 5 is a similar view of one of the tiles or plates detached. Fig. 6 is a cross-section showing a modified form of sheathing.

The object of my invention is to provide an easily-applied,durable, and effective sheathing for tubes of water-tube boilers.

The excessively-high temperature to which the lowermost tubes in a water-tube boiler are exposed in use makes it desirable to sheath such tubes with refractory material in order to prolong the useful life of the tubes.

Referring to the drawings, 1 1 represents three sections of tubes of a Water-tube boiler arranged side by side. The sheathing is composed of sheathing plates or tiles and keys whereby the same are supported in position.

In the preferred form of the invention(s hown in Figs. 1 to 5, inclusive) the sheathing plates or tiles 2 are of curved form adapted to receive one side of the respective tubes, and they are made in short sections that abut one upon another end to end, so as to cover and protect the under side of the tube, a sufiicient number of said tiles or plates being employed to sheath the tube for as much of its length as is desirable in each case.

Between neighboring tubes is inserted key mechanism comprising in the preferred form of the invention a pair of keys 4 4:, each abutting upon the other on one side and each engageable on its other side with oppositely-disposed portions of the adjacent tube and sheathing plate or tile. This is accomplished by providing the abutting sides of the keys with straight or otherwise engaging surfaces, whereby each key affords a supporting resistance to the other and the opposite or remote sides of the keys with concaved surface-s adapted to overhang the respective tubes and to extend sufliciently around the neighboring tiles or plates to be overhung by their side edges and form a support therefor. At the extreme sides of the furnace a single one of said keys may be inserted between the side wall 5 of the furnace and the tube most nearly adjacent thereto, as shown, in which case one side of the key abuts upon the side wall of the furnace which affords a resisting support therefor.

The form of the tiles and keys may be considerably varied without departing from my invention, it only being necessary that the keys should be suitably supporterl and adapted to engage ODPOSIlJGly-CllSlJOSGQl portions of the respective tubes and tiles, by which I. mean such portions as are so disposed in opposition to each other that the key by eugaging both will serve to lock the parts together.

As shown in Fig. 6, straight sheathing plates or tiles 7 are employed, the shape of the keys being correspondingly changed to receive the side edges thereof. I have shown also the key mechanism between two neighboring tubes in the form of a single integral key 8 having each of its opposite sides adapted each to engage oppositely-disposed portions of the tube and tile adjacent to said side.

As shown in the drawings, the tiles are arranged along the under sides of the tubes; but

I do not wish to be limited to such a construction, as the tiles can be applied to other portions of the tubes, if desired, the parts being so interlocked as to be self-supporting in all positions.

The tiles and keys may be made of any material, preferably fire-clay, capable of withstanding the heat to which their position in the furnace subjects them.

The several keys are shown the same length as the respective sheathing plates or tiles, thus forming a continuous bafilepartition across the furnace; but for certain purposes of the invention it is not necessary that the keys should be of the same length as the plates, and they may be made of any desired length adapting them to perform their supporting function.

What I claim as new, and desire to secure by Letters Patent, is-

1. The combination with atube; of asheathing tile or plate adjacent to one side of said tube; and a key engageable with oppositelydisposed portions of said tube and said plate or tile.

2. The combination with a tube; of a sheathing tile or plate located beneath said tube; and a key overhanging said tube and engageable with an overhanging portion of said tile or plate.

3. The combination with a tube; of a key overhanging said tube; and a sheathing tile or plate beneath said tube overhanging said key.

4. The combination with a tube; of a sheathing tile or plate located beneath said tube wholly below the horizontal axial plane thereof; and separate plate-supporting means-engageable with the upper side of said tube.

5. The combination with a tube; of a pair of keys on opposite sides of said tube each overhanging said tube; and a sheathing tile or plate beneath said tube overhanging at its opposite sides said keys respectively.

6. The combination with a plurality of tubes; of a plurality of sheathing plates or tiles adjacent to the respective tubes on one side thereof; and a pair of keys inserted between neighboring tubes, said keys abutting each upon the other on one side and each engageable on its other side with oppositely-disposed portions of the adjacent tube and sheathing plate or tile.

7. The combination with a tube; of a key overhanging said tube on one side; a resisting support for the opposite side of said key; and a sheathing plate or tile beneath said tube overhanging said key.

8. The combination with a tube; of a sheathing plate or tile adjacent to a side of the tube; a pair of keys on opposite sides of said tube having their neighboring sides adapted to be engaged by oppositely-disposed portions of said tube and sheathing plate or tile; and resisting-supports for the opposite sides of said keys.

In testimony whereof I have hereunto set my hand this 24th day of December, 19%.

JOHN D. ALEXANDER.

Witnesses:

FRANK C. CURTIs, E. M. OREILLY. 

